The stuff that was genuinely innovative will be remembered, the stuff that wasn’t won’t. This has always been the case and it has nothing at all to do with initial record sales, e.g. Neu! will be remembered long after Adele or whoever.
The interesting and totally unpredictable thing is what exactly future generations dig up for their influences, e.g. there is a lot of current jazz (Kamasi Washington, Thundercat, Joe Armon Jones etc) hugely influenced by things like George Duke’s early-70s BASF/MPS albums, 24 Carat Black etc that didn’t make that much of an impression at the time. Same with my generation who mined the then comparatively little-known/forgotten Velvet Underground, Seeds, MC5, Can etc. If it is genuinely good it will be immortal, and I am pretty certain it is the current musicians, who always have exceptional musical knowledge, will continue to be the curators of the past. I am certain the likes of Louis Armstrong, Joni Mitchell etc are safe, as are countless other genuine innovators who may still be well under the radar just as VU etc had to. Musical history has never followed the mainstream.